Answer
Exponential
$y=5*.4^x$
Work Step by Step
$2/5=.4$
$.8/2=.4$
$.32/.8=.4$
$.128/.32=.4$
$y=ab^x$
$5=ab^0$
$5=a*1$
$5=a$
$y=5*.4^x$
Algebra 1
by Hall, Prentice
Published by
Prentice Hall
ISBN 10:
0133500403
ISBN 13:
978-0-13350-040-0
Chapter 9 - Quadratic Functions and Equations - 9-7 Linear, Quadratic, and Exponential Models - Practice and Problem-Solving Exercises - Page 578: 16
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